Cumulative mass distribution of a power-law population for different inhomogeneity parameters φ_σ and collision velocities v₀ = 10   m   s^-1 (top) v₀ = 12.5   m   s^-1 (bottom). In both velocity cases both the mass of the largest member of the power-law population and the power-law slope decrease. This indicates the fragmentation to smaller aggregates for increasing φ_σ. For equal φ_σ, the slopes are shallower for the higher velocity. The power-law fit parameters can be found in Table 3.